Yui lived with her father and wanted to escape that life, so she aimed to advance her studies and move to the city. To do this, she had the cooperation of her homeroom teacher. However, in return, she became a tool for sexual gratification, offering her innocent body. When her father discovered this sordid relationship, her plans were foiled, and she ended up having to accept her father's penis, being penetrated by an incredibly thick cock until she was numb.
